WO2019181671A1 - Joint mécanique - Google Patents

Joint mécanique Download PDF

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Publication number
WO2019181671A1
WO2019181671A1 PCT/JP2019/010146 JP2019010146W WO2019181671A1 WO 2019181671 A1 WO2019181671 A1 WO 2019181671A1 JP 2019010146 W JP2019010146 W JP 2019010146W WO 2019181671 A1 WO2019181671 A1 WO 2019181671A1
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WO
WIPO (PCT)
Prior art keywords
mechanical seal
fixed
rotary shaft
housing
rotating shaft
Prior art date
Application number
PCT/JP2019/010146
Other languages
English (en)
Japanese (ja)
Inventor
忠弘 木村
康浩 池田
雅光 真田
壮敏 板谷
Original Assignee
イーグル工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by イーグル工業株式会社 filed Critical イーグル工業株式会社
Priority to CN201980015697.0A priority Critical patent/CN111788419B/zh
Priority to US16/976,018 priority patent/US11402023B2/en
Priority to JP2020508257A priority patent/JP7214716B2/ja
Priority to EP19771215.1A priority patent/EP3770471A4/fr
Publication of WO2019181671A1 publication Critical patent/WO2019181671A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3464—Mounting of the seal
    • F16J15/348—Pre-assembled seals, e.g. cartridge seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3496—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member use of special materials

Definitions

  • the present invention relates to a mechanical seal that seals a rotating shaft.
  • a space between a housing and a rotating shaft is sealed to prevent a sealed fluid sealed inside a housing such as a water pump for an automobile or a motor reducer from leaking to the atmosphere side.
  • Mechanical seals are known.
  • a mechanical seal provided on a rotating shaft of an automotive water pump disclosed in Patent Document 1 biases a sealing ring fixed to a housing by a biasing unit with respect to a mating ring fixed to the rotating shaft.
  • the space between the housing and the rotating shaft is sealed by bringing the sliding surfaces of the mating ring and the seal ring into sliding contact with each other.
  • the rotating shaft is made of metal, and is rotatably supported with respect to the inner periphery of the housing via a ball bearing that is externally fitted to the outer periphery of the rotating shaft while being inserted into the housing.
  • a harness drawn from a plus terminal of an electromagnetic coil constituting an electromagnetic clutch that connects and disconnects a rotational force transmitted to a rotating shaft is connected to a positive electrode of a battery, and a minus terminal
  • the harness pulled out from is grounded to the housing.
  • the present invention has been made paying attention to such problems, and an object of the present invention is to provide a mechanical seal capable of preventing charge accumulation on a rotating shaft.
  • the mechanical seal of the present invention is A fixed sealing element held at the inner periphery of the housing of the mounted device and having at least a fixed sealing ring;
  • An energizing element is provided between the fixed sealing element and the rotary shaft or the rotary shaft member fixed to the rotary shaft.
  • the said electricity supply element is fixed to the said fixed sealing element, and can supply with electricity with respect to the said rotating shaft.
  • the energizing element is provided in the fixed sealing element that does not rotate with the rotating shaft, the energizing element has high structural stability, and the energized state of the rotating shaft is easily maintained.
  • the energization element is fixed to the fixed sealing element and can energize the rotating shaft member. According to this, since the material and surface shape of the rotating shaft member can be selected and designed so as to be suitable for the energization element, the energization state is easily maintained.
  • the said rotating shaft member has a holding part holding the said rotation sealing ring, It is characterized by the above-mentioned.
  • the energization element can be incorporated into the mechanical seal to form a unit, and the distance between the fixed sealing element provided with the energization element and the rotary shaft member is kept constant, so that energization is ensured. Can do.
  • the fixed sealing element is an annular holder that is attached to the inner periphery of the housing, holds the fixed sealing ring, and has conductivity. According to this, it is possible to position the energization element simply by attaching the holder to the inner periphery of the housing, and to release the electric charge charged to the rotating shaft through the energization element and the holder to the housing.
  • the fixed sealing ring has conductivity. According to this, since it becomes difficult to charge the fixed sealing ring, the charge charged to the rotating shaft through the energizing element and the fixed sealing element is easily released to the housing.
  • a plurality of the energization elements are arranged in the circumferential direction. According to this, the electric charge charged to the rotating shaft through one of the energization elements with respect to the inclination of the rotating shaft can be released to the housing, and a low torque mechanical seal can be obtained.
  • the said electricity supply element contacts along the axial direction of the said rotating shaft or the said rotating shaft member in the state which bent the free end part. According to this, it is easy to maintain the contact state of the free end portion of the energization element even when the rotation shaft rotates in both directions.
  • the conductor is biased toward the rotating shaft by a biasing means having conductivity. According to this, it is easy to maintain the contact state of the current-carrying element against vibration due to disturbance or the like.
  • the said electricity supply element is comprised from the thin plate in which those plate surfaces were arranged in parallel along the circumferential direction. According to this, a wide contact area between the thin plate and the rotary shaft or the rotary shaft member can be secured.
  • the said electricity supply element is comprised from the magnet and the magnetic fluid. According to this, the contact resistance can be reduced.
  • the energizing element is a discharge needle whose free end is non-contact. According to this, since the free end portion of the energization element is always in a non-contact state, wear due to physical contact of the energization element does not occur.
  • FIG. 3 is an enlarged cross-sectional view showing a structure of a mechanical seal in Example 1.
  • FIG. 4 is a diagram illustrating an installation position of energization elements in the mechanical seal of Example 1. It is an expanded sectional view which shows the structure of the mechanical seal in Example 2 of this invention. It is a figure which shows the installation position of the electricity supply element in the mechanical seal of Example 2.
  • FIG. 6 is a diagram illustrating an installation position of an energization element in a mechanical seal of Example 3.
  • FIG. 10 is a diagram illustrating an installation position of energization elements in the mechanical seal of Example 4. It is an expanded sectional view which shows the structure of the mechanical seal in Example 5 of this invention. It is a figure which shows the installation position of the electricity supply element in the mechanical seal of Example 5.
  • FIG. 10 is a diagram illustrating an installation position of energization elements in the mechanical seal of Example 4. It is an expanded sectional view which shows the structure of the mechanical seal in Example 5 of this invention. It is a figure which shows the installation position of the electricity supply element in the mechanical seal of Example 5.
  • the motor M includes a rotating shaft 2 made of a conductive material such as stainless steel, a rotor 30 fixed to the rotating shaft 2, and a radially spaced outer periphery of the rotor 30.
  • An annular stator 40 is provided, and a housing 50 that supports the rotary shaft 2 and accommodates the rotor 30 and the stator 40 therein.
  • the stator 40 is fixed to the inner peripheral surface of the housing 50 by fixing means 60, and the rotor 30 is pivotally supported on the inner diameter side of the stator 40 via a pair of ball bearings 70.
  • the rotor 30 is an electromagnet formed by winding a coil, and the stator 40 is a permanent magnet, and a magnetic force is generated by energizing a coil constituting the rotor 30 from a power source (not shown).
  • the rotary shaft 2 fixed to 30 rotates together.
  • the housing 50 of the motor M is grounded to the vehicle body of the electric vehicle.
  • one end portion of the rotating shaft 2 of the motor M extends into the housing 80 of a reduction gear R (attached device) provided adjacently, and a gear unit G is attached.
  • the gear unit G is configured to obtain a torque proportional to the reduction ratio by reducing the rotational speed of the rotary shaft 2 and outputting it to the axle 90 that is connected and driven.
  • oil sealed fluid
  • gear unit G is stored in the housing 80 of the speed reducer R.
  • the housing 50 of the motor M and the housing 80 of the reduction gear R are made of a conductive material such as iron, and the opening 50a of the housing 50 and the opening 80a of the housing 80 face each other with the rotating shaft 2 inserted. Thus, the inside is sealed by being welded and fixed together.
  • the housing 80 of the reduction gear R connected to the housing 50 of the motor M may be grounded to the vehicle body of the electric vehicle.
  • the mechanical seal 1 of the present embodiment is attached to the outer periphery of the rotary shaft 2 and divides the space S2 in the housing 80 of the reduction gear R and the space S1 in the housing 50 of the motor M in a hermetically sealed state.
  • the rotating shaft 2 is supported by a ball bearing 71 provided adjacent to the mechanical seal 1 inside the housing 80 of the reduction gear R and a pair of ball bearings 70, 70 disposed on the stator 40. The inclination of the rotating shaft 2 with respect to the housing 50 and the housing 80 of the reduction gear R is suppressed.
  • the mechanical seal 1 includes a sliding contact surface 11 a of a seal ring 11 as a fixed sealing ring constituting the fixed sealing element 10 and a mating ring as a rotary sealing ring constituting the rotary sealing element 20.
  • a seal portion is formed between the slidable contact surfaces 11a and 21a by relative rotation with the slidable contact surface 21a abutted against the motor M located on the atmosphere side from the space S2 in the housing 80 of the speed reducer R. The oil to be leaked toward the space S1 in the housing 50 is sealed.
  • the seal ring 11 of this embodiment is made of conductive carbon
  • the mating ring 21 is made of SiC
  • the sliding material which forms the seal ring 11 and the mating ring 21 is applicable as long as it is used as a sliding material for a mechanical seal.
  • SiC a sintered body using boron, aluminum, carbon or the like as a sintering aid
  • SiC a sintered body using boron, aluminum, carbon or the like as a sintering aid
  • SiC a material composed of two or more phases having different components and compositions, for example, SiC, SiC in which graphite particles are dispersed
  • There are reactive sintered SiC, SiC-TiC, SiC-TiN, and the like composed of Si and Si, and as carbon, resin-molded carbon, sintered carbon, etc. can be used as well as carbon mixed with carbonaceous and graphite.
  • the rotary sealing element 20 includes an annular rotary seal ring holder 22 as a holder having a sleeve portion 22 a as a rotary shaft member that is liquid-tightly attached to the outer periphery of the rotary shaft 2, and a rotary seal.
  • An annular ring provided in a state of being rotatable integrally with the rotary shaft 2 via a cup gasket 23 having a substantially L-shaped cross section that is fixed to a U-shaped holding portion 22b having an orthogonal cross-sectional view of the ring holder 22 And the cup gasket 23 is clamped between the holding portion 22b of the rotating seal ring holder 22 and the mating ring 21, thereby holding the holding portion 22b of the rotating seal ring holder 22. And oil leakage between the mating ring 21 are prevented.
  • the cup gasket 23 is made of an elastic body, the material is not limited to rubber but may be resin or the like.
  • the rotary seal ring holder 22 has the sleeve portion 22a and the holding portion 22b integrally formed. However, the rotary seal ring holder 22 needs to function as both the sleeve portion 22a and the hold portion 22b. There may be no separate body.
  • the mating ring 21 has a notch-shaped insertion portion 21b formed on the outer peripheral side.
  • the insertion plate 21b constitutes an outer diameter portion of the holding portion 22b of the rotary seal ring holder 22 and extends in the axial direction to the atmosphere side. By inserting 22c, it can rotate integrally with the rotating shaft 2.
  • the fixed sealing element 10 includes an annular sealing ring 11 and an annular fixing as a holder that is liquid-tightly attached to the inner periphery of the housing 50 of the motor M and the housing 80 of the reduction gear R.
  • the seal ring 11 is mainly composed of a sealing ring holder 12.
  • the sealing ring 11 is a mating ring via an annular retainer 14 by a biasing means 13 which is an annular push spring held in the fixed seal ring holder 12. 21 is biased in the axial direction.
  • the seal ring 11 is prevented from rotating with respect to the holder 12.
  • the fixed sealing ring holder 12 includes an annular base portion 12a extending in the radial direction by pressing a conductive metal plate, a first cylindrical portion 12b extending in the axial direction from the outer diameter portion of the base portion 12a to the oil side, and a base portion A step-shaped second cylindrical portion 12c extending in the axial direction from the inner diameter portion of 12a to the oil side is formed in a U-shaped annular shape in which the cross-sectional viewing angle portions are orthogonal to each other.
  • first cylindrical portion 12b is sandwiched in the axial direction in a state of being inserted into the recesses formed in the opening 50a of the housing 50 of the motor M and the opening 80a of the housing 80 of the speed reducer R, and thus fixed.
  • the seal ring holder 12 is in reliable contact with the housing 50 of the motor M and the housing 80 of the reduction gear R.
  • the second cylindrical portion 12c includes a base side cylindrical portion 12e extending orthogonally to the base portion 12a and extending in the axial direction, a side plate portion 12f extending orthogonally to the base side cylindrical portion 12e and extending in the inner diameter direction, and the side plate portion 12f.
  • the end plate side cylindrical portion 12g extends orthogonally and extends in the axial direction, and the end plate portion 12h extends in the outer diameter direction while being inclined to the end plate side cylindrical portion 12g.
  • the second cylindrical portion 12c is formed with an annular groove 12k that is recessed toward the inner diameter side by the side plate portion 12f, the end plate side cylindrical portion 12g, and the end plate portion 12h, and is fitted over the annular groove 12k.
  • annular step portion 12m exposed to the atmosphere side is formed on the inner peripheral side of the second cylindrical portion 12c (that is, the rotating shaft 2 side), and this annular step portion 12m is a sleeve of the rotary seal ring holder 22.
  • the positional relationship overlaps with the portion 22a in the axial direction.
  • a fixed end portion 16a of a brush member 16 as a conductive element having conductivity is fixed to the inner diameter portion of the base portion 12a on the atmosphere side of the fixed seal ring holder 12, and the brush member 16 rotates the free end portion 16b.
  • the contact is made in a state of being bent along the axial direction of the shaft 2.
  • the brush member 16 is composed of a low-rigidity metal wire. Further, as shown in FIG. 3, the brush member 16 is configured to have a small size in the circumferential direction (that is, the width direction), and is equally arranged in the circumferential direction of the rotating shaft 2.
  • the brush member 16 is provided between the fixed sealing ring holder 12 constituting the fixed sealing element 10 and the rotating shaft 2, whereby the electric charge charged on the rotating shaft 2 is transferred to the brush member 16 and the fixed sealing ring holder. 12. Since it can escape through the grounding path in the order of the housing 50 of the motor M, it is possible to prevent charge accumulation on the rotating shaft 2. Further, since the brush member 16 is fixed to the fixed sealing ring holder 12 that does not rotate together with the rotating shaft 2, the brush member 16 is hardly affected by centrifugal force and the like, and the structural stability can be improved. 2 is easily maintained.
  • the brush member 16 can be positioned with respect to the rotary shaft 2 and the grounding path can be established only by attaching the fixed sealing ring holder 12 to the inner periphery of the housing 50 of the motor M and the housing 80 of the reduction gear R. Further, since the fixed seal ring holder 12 has electric conductivity, the charge charged to the rotating shaft 2 can be stably released to the housing 50 of the motor M through the fixed seal ring holder 12 after passing through the brush member 16. .
  • seal ring 11 held by the fixed seal ring holder 12 is conductive, it is difficult for the seal ring 11 to be charged, and the charge charged to the rotary shaft 2 is easily released through the grounding path. 2 is difficult to accumulate electric charges.
  • the brush member 16 is provided in a plurality of locations in the circumferential direction of the rotation shaft 2, the rotation shaft 2 is charged through a grounding path connected to any one of the brush members 16 with respect to the inclination of the rotation shaft 2.
  • a low-torque mechanical seal can be obtained by allowing the charge to escape and reducing the contact area with the rotating shaft 2.
  • the brush member 16 is made of a low-rigidity metal wire and has a small size in the circumferential direction (that is, the width direction), the pressing force against the rotating shaft 2 can be reduced, and a low-torque mechanical seal. Is obtained.
  • the brush member 16 contacts along the axial direction of the rotary shaft 2 with the free end portion 16b being bent, the brush member 16 is also capable of rotating in both directions of the rotary shaft 2 (that is, forward rotation and reverse rotation). It is easy to maintain the contact state of the free end 16b of the brush member 16. Furthermore, since it becomes easy to follow the movement and inclination of the rotating shaft 2 in the axial direction, the energized state of the rotating shaft 2 is easily maintained.
  • the brush member 16 can be provided with an energizing function by being fixed to the fixed sealing ring holder 12 that constitutes the fixed sealing element 10 of the mechanical seal 1, it is like a motor and a reduction gear of a conventional electric vehicle.
  • it is not necessary to provide a separate earth chamber and bring a current-carrying element such as a carbon brush into contact with the axle 90, thereby saving space and cost.
  • the brush member 16 is provided in the mechanical seal 1 adjacent to the ball bearing (particularly, the oil-side ball bearing 71), the ball bearing 71 is present near the brush member 16, so that electric energy in the ball bearing 71 is reduced. It is easy to suppress the occurrence of instantaneous bursts. Furthermore, since the ball bearing 71 is disposed nearby, the positioning accuracy of the brush member 16 with respect to the rotating shaft 2 is good.
  • the fixed end portion 16a of the brush member 16 is not limited to the one fixed to the base portion 12a of the fixed sealing ring holder 12, but for example, an annular step portion 12m (base side) formed on the inner peripheral side of the fixed sealing ring holder 12 It may be fixed to the cylindrical portion 12e), and in this case, the free end portion 16b may be brought into contact with the rotary shaft 2 or the sleeve portion 22a of the rotary seal ring holder 22 as the rotary shaft member.
  • the inner diameter portion of the base portion 12a of the fixed seal ring holder 12 and the annular step portion 12m of the second cylindrical portion 12c are located on the inner diameter side of the through hole through which the rotary shaft 2 of the housing 50, 80 is inserted, that is, through. It is located closer to the rotating shaft 2 than the inner periphery of the hole. Therefore, the brush member 16 can be configured to be small in the radial direction by arranging the brush member 16 in these portions.
  • Example 2 The mechanical seal 101 in Example 2 will be described.
  • a carbon brush 116 having conductivity as a conductor and a current-carrying element is used as a current-carrying element on the base-side cylindrical portion 12e of the annular step 12m of the fixed sealing ring holder 12.
  • the carbon brush 116 is pressed against the sleeve portion 22a of the rotary seal ring holder 22 as the rotary shaft member by being provided in a state of being biased in the inner diameter direction by the biasing means 117 which is a push spring having a conductive property.
  • the carbon brush 116 and the urging means 117 are provided between the fixed seal ring holder 12 constituting the fixed seal element 10 and the sleeve portion 22a of the rotary seal ring holder 22 as the rotary shaft member. Since the charge charged on the rotary shaft 2 can be released through the grounding path in this order, the sleeve portion 22a of the rotary seal ring holder 22, the carbon brush 116, the urging means 117, the fixed seal ring holder 12, and the housing 50 of the motor M. Charge accumulation on the shaft 2 can be prevented.
  • one carbon brush 116 and urging means 117 may be provided in the circumferential direction of the sleeve portion 22a (rotating shaft 2). Note that a plurality of carbon brushes 116 and urging means 117 may be installed in the circumferential direction of the sleeve portion 22a.
  • the carbon brush 116 as the energization element can be selected and designed so that the material and surface shape of the sleeve portion 22a are suitable for the energization element by contacting the sleeve portion 22a of the rotary seal ring holder 22 and energizing. The state is easy to be maintained. Further, the carbon brush 116 and the urging means 117 can be incorporated into the mechanical seal 101 to form a unit, and the distance between the fixed seal ring holder 12 provided with the carbon brush 116 and the urging means 117 and the sleeve portion 22a is increased. Since it is held constant, it can be energized reliably.
  • the base side cylindrical portion 12 e of the annular step portion 12 m of the fixed seal ring holder 12 is provided with a U-shaped holding member 217 having a cross-sectional viewing angle portion having conductivity.
  • a leaf member 216 (energization element) is provided that is formed of a conductive thin plate that is held and arranged in parallel along the plate surface in the circumferential direction. Further, as shown in FIG. 7, the leaf members 216 are configured to have a small size in the circumferential direction (width direction), and are equally arranged in the circumferential direction of the rotary seal ring holder 22 (rotary shaft 2).
  • the leaf member 216 is provided between the fixed seal ring holder 12 constituting the fixed seal element 10 and the sleeve portion 22a of the rotary seal ring holder 22 as the rotary shaft member, whereby the rotary shaft 2 is charged.
  • the accumulated charge can be released through the grounding path in the order of the sleeve portion 22a of the rotary seal ring holder 22, the leaf member 216, the fixed seal ring holder 12, and the housing 50 of the motor M, so that accumulation of charge on the rotary shaft 2 is prevented. Can do.
  • the tip of the thin plate constituting the leaf member 216 can be brought into contact along the axial direction of the sleeve portion 22a of the rotary seal ring holder 22 to ensure a wide contact area. it can.
  • the thin plate constituting the leaf member 216 is easily bent in the circumferential direction, it is easy to maintain the state in contact with the sleeve portion 22a of the rotary seal ring holder 22 along the axial direction.
  • the base side cylindrical portion 12e of the annular step portion 12m of the fixed seal ring holder 12 is provided with a through hole 317a for air introduction (see FIG. 9).
  • An annular magnet 317 as an energization element is fixed, and a fluid film composed of a magnetic fluid 316 as an energization element is held between the sleeve portion 22a of the rotary seal ring holder 22 in the circumferential direction.
  • the magnetic fluid 316 and the magnet 317 are provided between the fixed seal ring holder 12 constituting the fixed seal element 10 and the sleeve portion 22a of the rotary seal ring holder 22 as the rotary shaft member, whereby the rotary shaft 2 can be discharged through the grounding path in the order of the sleeve portion 22a of the rotary seal ring holder 22, the magnetic fluid 316, the magnet 317, the fixed seal ring holder 12, and the housing 50 of the motor M. Can be prevented.
  • Example 5 The mechanical seal 401 in Example 5 will be described.
  • a fixed end portion 416 a of a discharge needle 416 having conductivity as an energization element is provided on the inner diameter portion of the base portion 12 a.
  • the needle-like free end 416b is fixed and held in a non-contact state with respect to the rotating shaft 2.
  • the discharge needle 416 is composed of a low-rigidity metal wire.
  • the discharge needle 416 is provided between the fixed sealing ring holder 12 constituting the fixed sealing element 10 and the rotating shaft 2, whereby the electric charge charged on the rotating shaft 2 is discharged to the discharge needle 416, the fixed sealing ring holder. 12. Since it can escape through the grounding path in the order of the housing 50 of the motor M, it is possible to prevent charge accumulation on the rotating shaft 2.
  • ions having a charge opposite to the charge charged on the rotating shaft 2 can be electrically neutralized by being attracted to the free end 416b of the discharge needle 416, the charge is accumulated on the rotating shaft 2. It is difficult to prevent an instantaneous burst of electrical energy. Further, since the free end 416b of the discharge needle 416 is always in a non-contact state with respect to the rotating shaft 2, wear of the discharge needle 416 can be suppressed.
  • the fixed end portion 416a of the discharge needle 416 is not limited to the one fixed to the base portion 12a of the fixed sealing ring holder 12, but for example, the base side of the annular step portion 12m formed on the inner peripheral side of the fixed sealing ring holder 12 It may be fixed to the side plate portion 12f constituting the cylindrical portion 12e or the annular groove 12k.
  • a seal portion formed between the sliding contact surfaces 11a and 21a of the seal ring 11 and the mating ring 21 is provided in the housing 80 of the reducer R on the outer peripheral side.
  • the seal ring 11 is moved to the mating ring 21 side by a so-called inside type and urging means 13 that seals oil that leaks from the space S2 toward the space S1 in the housing 50 of the motor M on the inner peripheral side.
  • the energizing element may be provided on an outside-type or rotary-type mechanical seal.
  • the installation to the mechanical seal which seals between the housings 50 and 80 and the rotating shaft 2 between the motor M and the reduction gear R was demonstrated to the example as an installation example of the electricity supply element with respect to a mechanical seal.
  • the present invention is not limited to this, and the energization element may be installed on a mechanical seal provided on a rotating shaft such as a water pump.
  • the energizing element is described as being fixed to the fixed sealing element 10 (fixed sealing ring holder 12) constituting the mechanical seal. May be fixed to the rotary shaft 2 or the rotary seal ring holder 22 (sleeve portion 22a) as long as it is provided between the rotary shaft 2 or the sleeve portion 22a of the rotary seal ring holder 22 as the rotary shaft member.
  • the energizing member fixed to the sleeve portion 22a of the rotary seal ring holder 22 may be in contact with the end plate portion 12h of the second cylindrical portion 12c.
  • the energization element may be either in contact or non-contact with the other end on the free end side.
  • the fixed sealing element 10 If a part of the energizing element is provided between the fixed sealing element 10 and the rotary shaft 2 or the sleeve portion 22a of the rotary seal ring holder 22 as the rotary shaft element, one end directly contacts the housing. It may be. In this case, the fixed sealing element may not have conductivity.
  • At least one energizing element in the first to third and fifth embodiments is provided in the circumferential direction.
  • the energization element in the first to third embodiments may be any element that contacts at least one of the rotary shaft 2 or the sleeve portion 22a of the rotary seal ring holder 22.
  • the energization element is made of a conductive material
  • the material may be freely selected, but the wear resistance against friction with the rotary shaft 2 or the sleeve portion 22a of the rotary seal ring holder 22 is not limited. It is preferable that it is comprised from a high material.
  • the rotary shaft 2 or the rotary seal ring holder 22 (sleeve portion 22a), the motor M housing 50, the reducer R housing 80, the fixed seal ring holder 12 and the like are made of a conductive material.
  • the material may be freely selected.
  • the rotary seal ring holder 22 only needs to be made of a material having at least a sleeve portion 22a in contact with the energization element.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Mechanical Sealing (AREA)

Abstract

Cette invention concerne un joint mécanique permettant d'éviter l'accumulation d'une charge sur un arbre rotatif. Ce joint mécanique (1) est comprend : un élément d'étanchéité fixe (10), qui est retenu sur la périphérie interne de boîtiers (50) et (80) de machines à fixer l'un à l'autre, et a au moins une bague d'étanchéité fixe (11) ; et un élément d'étanchéité rotatif (20), qui est retenu sur la périphérie externe d'un arbre rotatif (2) supporté de manière à pouvoir tourner dans les boîtiers (50) et (80), et a au moins une bague d'étanchéité rotative (21). Un élément conducteur (16) est disposé entre l'élément d'étanchéité fixe (10) et l'arbre rotatif (2) ou un élément d'arbre rotatif (22a) fixé à l'arbre rotatif (2).
PCT/JP2019/010146 2018-03-23 2019-03-13 Joint mécanique WO2019181671A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201980015697.0A CN111788419B (zh) 2018-03-23 2019-03-13 机械密封
US16/976,018 US11402023B2 (en) 2018-03-23 2019-03-13 Mechanical seal
JP2020508257A JP7214716B2 (ja) 2018-03-23 2019-03-13 メカニカルシール
EP19771215.1A EP3770471A4 (fr) 2018-03-23 2019-03-13 Joint mécanique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018056154 2018-03-23
JP2018-056154 2018-03-23

Publications (1)

Publication Number Publication Date
WO2019181671A1 true WO2019181671A1 (fr) 2019-09-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/010146 WO2019181671A1 (fr) 2018-03-23 2019-03-13 Joint mécanique

Country Status (5)

Country Link
US (1) US11402023B2 (fr)
EP (1) EP3770471A4 (fr)
JP (1) JP7214716B2 (fr)
CN (1) CN111788419B (fr)
WO (1) WO2019181671A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117145972A (zh) * 2023-11-01 2023-12-01 自贡市川密机械密封件有限公司 一种密封压力可调式机械密封装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11739844B2 (en) 2016-09-14 2023-08-29 Eagle Industry Co., Ltd. Mechanical seal
JP7118566B2 (ja) * 2017-09-20 2022-08-16 イーグル工業株式会社 メカニカルシール
EP3757432B1 (fr) 2018-02-21 2023-10-18 Eagle Industry Co., Ltd. Joint mécanique
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US20210003221A1 (en) 2021-01-07
EP3770471A1 (fr) 2021-01-27
CN111788419A (zh) 2020-10-16
EP3770471A4 (fr) 2021-12-22
JP7214716B2 (ja) 2023-01-30
JPWO2019181671A1 (ja) 2021-03-25
CN111788419B (zh) 2023-08-01

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